This issue appears to occur if you’ve installed iTunes through the Windows Store rather than as a standalone executable. It appears that the Deployment Server has a dependency on iTunes and fails to start correctly when the Windows Store version is installed.
To fix it:
- From your windows Start Menu, find iTunes, right-click it and uninstall it.
- Head over to the iTunes download page. Do not use the “Get it from
Microsoft” link. Use the “Looking for other versions” link instead to download the installer and install it as a standalone application.
In my case, since the Unreal Editor was still running while I performed the install, as soon as the new iTunes installed itself, Windows Firewall opened a dialog box asking me whether I wanted to allow Deployment Server access.
iOS builds on the PC worked after that.